Abstract
Critical thermal maximum (CTM) was used to compare thermal tolerances of five species of small mammals ( Mus musculus, Rattus norvegiens, Peromyscus leucopus, Meriones unguiculatus , and Dipodomys ordii ). All experimental animals were acclimatized to 25 ± 1°C and a 12L:12D photoperiod. The CTM of D. ordii (45.03 ± 0.22°C) was significantly higher ( P < 0.01) than that of all other species. The CTM of M. musculus (42.62 ± 0.23°C) was significantly lower ( P < 0.01) than that for R. norvegicus (44.22 ± 0.30°C) and there were no differences between the CTMs of M. unguiculatus (44.00 ± 0.21°C) and R. norvegicus .
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